Billboard Icon Award recipient Celine Dion performs "The Show Must Go On" at the 2016 Billboard Awards in Las Vegas, Nevada, May 22, 2016. [Photo/Agencies]

While several awards were handed out during the show, including to British singer Adele who won the big prize, top artist and accepted via a video segment, it was performances by the likes of Ariana Grande, Dion, and Rihanna that ruled.

Dion, making her first televised singing performance since the death of her husband, Rene Angelil, tearfully accepted the Icon Award for lifetime achievement, which in a surprise was presented by her son, Rene-Charles.

"I'm so sorry, I don't want to cry in front of you," Dion told the audience. She ended by holding her award aloft and declaring, "Rene, this one's for you, the show must go on," echoing the title of the Queen song she had just performed.

Other top prizes went to Rihanna in the fan-voted chart achievement award, Justin Bieber for top male artist, Adele for both top female artist and Billboard 200 album, and The Weeknd for R & B song "The Hills."